The relentless TV coverage of the manhunt for the surviving Boston bomber suspect will continue into the primetime hours.

"Vegas" is being rescheduled from its 8 p.m. Friday time slot because of the Boston bombings.

The CBS drama "Vegas" is getting booted to Saturday night to make way for a CBS News special report, "Boston Bombers," from 8 to 9 p.m. on WBBM-Channel 2. Scott Pelley will anchor the special as well as an extended, hour-long broadcast of CBS Evening News.

On ABC, Diane Sawyer will helm an extended hour of ABC World News. Elizabeth Vargas will oversee a special live edition of 20/20 from Boston at 9 p.m. This evening's Nightline broadcast also will be live from Boston with Juju Chang reporting.

Late Friday morning NBC "Today" show's Savannah Guthrie passed the baton of live coverage to Brian Williams, who will devote tonight's hour-long broadcast of Rock Center (9 to 10 p.m. on WMAQ-Channel 5) to the events in Boston. Like ABC and CBS, NBC Nightly News also is expanding its program to a full hour.